Electric switch



I. H. KAUFMAN.

ELECIRIC SWITCH. APPLICATION man SEPT-21. I918.

Patented Feb. 24, 1920.

' a citizen of the United able good contact to be made .12 is the removable an outside stop UNITED STATES PATENT OFFICE.

IR'VIN H. KAUFMAN, OF NEW Y OBK, N. Y., ASSIGNOB TO THE BLACKBURN-SMITH CORPORATION, A CORPORATION OF NEW YORK.

ELECTRIC SWITCH.

Specification ot'Lettex-a Intent.

Patented Feb. 24, 1920.

' To all whom it may concern Be it known that I, Iavm KAUFMAN,

of the cit of New York, in the count of New Yor and State of New York, lave invented certain new and useful Improvements in Electric Switches, of which the fol lowing is a. s cificatioh;

This invention relates to electric switches, and has for its object to provide a simple and positively operating form of quick make and break switch especially adapted to be controlled by a float, rod or the like. The mechanism is preferably inclosed in a case so as to be protected from noxious vapors or gases, and is made compact so as to go in a small space.

The accompanying drawings show a preferred form of the invention wherein- Figure 1 is a front elevation, with the cover removed;

Fig. 2 is an end elevation;

Fig. 3 is a rear view.

The mechanism comprises a ivotally movable arm 1, carrying a pivote contact block 2, coiiperatin with fixed carbon contacts 3, 3, mounts in separate terminal blocks 4, 4, on insulating base 5; The ivoted contact block is composed of ins ating material and carries a conducting bridge 6 which closes the circuit across contacts 3, 3, when the switch is closed. The contacts 3, are replaceable and adjustable in the blocks 4, being fastened by screws 7 8, 9, are the line wires which lead in through the nipple 10 on thebase 11 of the casing. The usual armored conduit'is attached to the nipple 10. front cover. 13 is a small spring bearing on the contact block 2 for holding its edge parallel to the contacts 3, but yielding when necessary to onwith both contacts 3.

The actuating means consists of a bell crank pivoted to the case 11 and having its external arm 14 resting between collars 15 on a float or otherwise actuated rod 16, and its inner endl'? carrying a link 18 with roller 19 held on the spear head or cam and 20 of arm 1 by spring 21. 22 is an interior stop for the arm in open position, and 23 is for the lever arm 14in 24 of connterweights 25. 22 is a lugbdarri ed by the base 11 for limiting the switc move- States, and resident slightly channeling ment, and 26 is a lug for mounting the 4 switch where desired.

In operation, movement of the arm 14 causes the roller 19 to move on the curved cam surface 20 toward the point while stretching spring 21 to store up suflicient power to thickly throw the main switch arm 1 as; sooi. as the roller passes suliiciently far past th:- center of the cam 20. This forms a simple and sure means for quickly operatin the switch with a minimum of arcing, an since spring 21 is always stron er than spring 13, the circuit is always tight y closed across contacts 3 by positive pressure of sprin 21. Moreover, a good surface contact is provided, which is increased by rounded contour of connecting bridge 6. The switch complies with all underwriters requirements and does not have any live part beyond the terminals and contact bloc; 3, 4, and the bridge 6. Qwing to its structure-it will resist noxious vapors and gases, and is still furtherprotected by the complete inclosing casing.

Various modifications and changes may be made without departing from the scope of the .4 pended claims.

I e aim:

1. A switch comprising a stationary contact, a movable arm carryin a contact, a double actuating cam on sai arm, a lever mechanism havin a link engaging said cam, and a spring hol ing the link engage with the cam and throwing the cam an arm as the lever is operated to move the link on said cam.

2. A switch comprising a stationary contact, a movable arm carryin a contact, a double actuating cam carrie by said arm, and a bodily movable link and a spring for actuating said cam through pc or stored in the spring by movement of the l nk.

3. n a switch, separated line terminals, a switch arm insulated therefrom and carry ingoa pivoted bridging conductor, means ho ding the conductor in position to aline with both terminals, a cam. carried by the said arm, a floating-lever in rolling pressure engagement with said arm and means whereby the pressure of the lever on the cam is increased. upon a predetermined movement of thc'lever to actuate the cam.

4. In a switch, a casing, 'a line termina the contacts 3 to fit the block a switch arm 'nsulated therefrom and car mg a, pivote contact block, means 110] ing the contact block in predetermined osition, a double 'ca-in carried by the said rm, eleven. joul'naled on the casing having an external and an internal arm, a level connected to said arm in pressure rolling engagement with the said cum, tlie'said lever exerting pressure through said cam on said arm first in one direction and then in the reverse direction to actuate said arm during the operation of the said leven in one direction and stopping means for the arm.

5. In a SWltCh, a casing, a rock shaft having an arm, it link connected to said lll'lll, a roller carried 'by said link a s ring eonneoted to the mid portion 0 sai link and to the casingQa pivoted switch arm having at double cam fio'r said roller and movable back and forth a said shaft is rocked.

Si ned at New York in the county of New Y0! and State of New York this 16th do of September A. D. 1918. p

IRVIN H. KAUFMAN.

Witnesses:

W. B. PUTNEY, Jr., Joann; BOLLACEK. 

